CVE-2025-37752 (GCVE-0-2025-37752)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2025-08-28 14:42
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8
Impacted products
Vendor Product Version
Linux Linux Version: e12f6013d0a69660e8b99bfe381b9546ae667328
Version: 1e6d9d87626cf89eeffb4d943db12cb5b10bf961
Version: 1b562b7f9231432da40d12e19786c1bd7df653a7
Version: 35d0137305ae2f97260a9047f445bd4434bd6cc7
Version: 833e9a1c27b82024db7ff5038a51651f48f05e5e
Version: 7d8947f2153ee9c5ab4cb17861a11cc45f30e8c4
Version: 7fefc294204f10a3405f175f4ac2be16d63f135e
Version: 10685681bafce6febb39770f3387621bf5d67d0b
Version: 10685681bafce6febb39770f3387621bf5d67d0b
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   Linux Linux Version: 6.14
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_sfq.c"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "6.6.88",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.24",
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              "status": "unaffected",
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              "versionType": "semver"
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              "version": "6.14.3",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.1.135",
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                  "vulnerable": true
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                  "versionEndExcluding": "6.6.88",
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: move the limit validation\n\nIt is not sufficient to directly validate the limit on the data that\nthe user passes as it can be updated based on how the other parameters\nare changed.\n\nMove the check at the end of the configuration update process to also\ncatch scenarios where the limit is indirectly updated, for example\nwith the following configurations:\n\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1\n\nThis fixes the following syzkaller reported crash:\n\n------------[ cut here ]------------\nUBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6\nindex 65535 is out of range for type \u0027struct sfq_head[128]\u0027\nCPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429\n sfq_link net/sched/sch_sfq.c:203 [inline]\n sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231\n sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493\n sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\n tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\n dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311\n netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline]\n dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:42:49.885Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219"
        },
        {
          "url": "https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70"
        }
      ],
      "title": "net_sched: sch_sfq: move the limit validation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37752",
    "datePublished": "2025-05-01T12:55:57.280Z",
    "dateReserved": "2025-04-16T04:51:23.937Z",
    "dateUpdated": "2025-08-28T14:42:49.885Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37752\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:53.933\",\"lastModified\":\"2025-08-28T15:15:47.020\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet_sched: sch_sfq: move the limit validation\\n\\nIt is not sufficient to directly validate the limit on the data that\\nthe user passes as it can be updated based on how the other parameters\\nare changed.\\n\\nMove the check at the end of the configuration update process to also\\ncatch scenarios where the limit is indirectly updated, for example\\nwith the following configurations:\\n\\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1\\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1\\n\\nThis fixes the following syzkaller reported crash:\\n\\n------------[ cut here ]------------\\nUBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6\\nindex 65535 is out of range for type \u0027struct sfq_head[128]\u0027\\nCPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120\\n ubsan_epilogue lib/ubsan.c:231 [inline]\\n __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429\\n sfq_link net/sched/sch_sfq.c:203 [inline]\\n sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231\\n sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493\\n sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518\\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\\n tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339\\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\\n dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311\\n netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline]\\n dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: mover la validaci\u00f3n del l\u00edmite No es suficiente validar directamente el l\u00edmite en los datos que pasa el usuario, ya que se puede actualizar en funci\u00f3n de c\u00f3mo se modifiquen los dem\u00e1s par\u00e1metros. Mueva la comprobaci\u00f3n al final del proceso de actualizaci\u00f3n de configuraci\u00f3n para que tambi\u00e9n detecte los escenarios en los que el l\u00edmite se actualiza indirectamente, por ejemplo, con las siguientes configuraciones: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 Depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 Esto corrige el siguiente fallo informado por syzkaller: ------------[ cortar aqu\u00ed ]------------ UBSAN: array-index-out-of-bounds en net/sched/sch_sfq.c:203:6 el \u00edndice 65535 est\u00e1 fuera de rango para el tipo \u0027struct sfq_head[128]\u0027 CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 No contaminado 6.14.0-rc2-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 27/12/2024 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [en l\u00ednea] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [en l\u00ednea] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [en l\u00ednea] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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